The Purple Bone , does some heavy nylon type soft toys that are quite weighty . I got one for my dog for Christmas ,in the hope it was terrier proof ,but it wasn't. It would be ok for throwing and tough and hard wearing for normal non-destructive dogs.
What about one of the Kong brand kicker toys? They look a bit like an octopus, but you could grab one of the 'legs' and throw it pretty far, I should think. Got one of the smaller ones for the kitten, but the large ones would be good for a dog.
I want the duck on a rope! I was in tkmaxx on sat they didn't have that, they didn't have a raccoon with a tennis ball inside, but it was still a bit light, I ended up buying her a toy for the house, a cloth/fur parrot that you but empty water bottles inside for her to crunch on, she likes it but now I'm on a mission for that duck!
I got one of those ducks from tkmaxx as thought it looked tough. Sadly he still did his pesky terrier number on it and held it down and ripped its face off on day one. By day two it was in about thirty pieces. I give in !